Review on ElectroCookie Proto Shield Kit - Arduino Mega R3 Compatible, Stackable Prototype Expansion PCB (2 Pack) by Eric Froedge

This board was almost great, but it was missing some key elements needed for an Arduino proto-shield. Center 5V and ground rails are good, as are the numerous connected pads scattered around the board, but the SDA and SCL pins are treated like all other pins instead of rails like 5V and ground to them so you need one more board Connect multiple I2C add-ons. The board also lacks a screw hole next to the USB pad, leaving a good half of the board loose if you need a tight fit. Even though some sections are connected to traces, the board appears to rely on the Arduino's internal circuitry to connect similar circuits such as power and ground. It's fine if you're mounting it strictly as a shield, but it sucks if you're short on space and trying to solder only the connections you need. I wouldn't buy it again but I think I can handle it.